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SMC_LID is normal and working, return resistors all seem good too. Joining EN and PWM still results in no backlight. I've ordered some replacement drivers, hopefully have them for Monday. Thanks both!

Swapped DC-in, no difference. Actually... haven't tried adjusting under macOS, but assumed (perhaps foolishly) that the PRAM reset would auto-max the backlight. I'll boot into an OS and try that.

I've got an 820-00165 here that came in with no backlight, working perfectly apart from that (image is fine). Only visible corrosion I could see was a tiny amount around U5110 which I cleaned up, it seemed entirely cosmetic. D7701 - 8.6v both sides XW7720 - 8.6v and clean BKL_EN - 2.83v...

These were all OEM pulled from dead machines, but probably just sat on the shelf for way too long. I need to sort through this shit and test everything, it's just finding time...

Looks like this can be closed, apologies, appears to be two bad batteries in a row!

820-3330 powering and working perfectly off the MagSafe charger, reporting the battery percentage OK, but not charging and no orange light (just green all the time). Machine dies immediately if MacSafe is pulled. Board looks really clean, no signs of any liquid, area around U7000 is immaculate...

Apologies, diode mode to 3 points: SCL - 0.576 SDA - 0.574 So I'm guessing that's close enough to be OK?

Q5050 is still off at this stage. Removing R5054 had no affect. SMBUS_SMC_1_S0_SCL - 3.39 & 0.56 SMBUS_SMC_1_S0_SDA - 3.29 & 0.55

Anything else worth trying?

Seeing identical results with the Q5050 removed.

PM_PWRBTN_L - 3.43 PM_RSMRST_L - 3.30 SMC_ONOFF_L - 3.44 PM_PWRBTN_L drops when SMC_ONOFF_L is triggered 1V05_SUS - 1.05 SMC bypass has no noticeable affect.

Neither made any difference unfortunately, that same sensor is being flagged in MRI, though I guess it's possible that could be a wild goose chase...

Board not powering following a claimed power surge. Everything above S4 that I can check exists and is in normal range, no PM_SLP_S4_L, voltage rails/readings as follows: PPBUS_G3H - 12.56 PPBUS_S5_HS_COMPUTING - 12.56 PP3V42_G3H - 3.45 PP5V_S5 - 5.02 PP5V_S4 (and 3 and 0) - 0 PP3V3_S5 - 3.34...

MRI shows -127 for CPU Core PECI, everything else normal and in range. No liquid damage, came in following a power surge, powers up normally, just full fan speed and very very slow to boot/run. Components from the PECI circuit, let me know any other readings that would be useful: Resistance...

Yep, 20ohms, which seems consistent with reference boards.

Yes, all tested OK, but it looks like my replacement U7100 might have been dead, I've swapped it again and we have fan spin. Need to test fully, but looks like it's OK. Thanks for your help!

Replaced C7120 and U7100, but that resistance remains. Damage in the board, or have I missed something?

17 & 18: 4 ohms 27 & 28: 718 ohms

Swapped U7501 and it looks like we're still the same.

Back down to 1.6v on PPBUS_G3H. I'll swap U7501 and report back.